By-products from the essential oil industry – hydrothermal and enzymatic hydrolysis for obtaining low-molecular carbohydrates Hydrothermal and enzymatic hydrolysis of rose and lavender residues
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Abstract
Solid industrial post-distillation rose (Rosa damascena) – RD, and lavender (Lavandula angustifolia) – L, residues were subjected to enzymatic and hydrothermal/enzymatic pretreatments aiming at increase of released low-molecular carbohydrates and obtaining of residual biomass, suitable for adsorption of pollutants. Enzymatic pretreatment with Novozymes Viscoferm® combined with preliminary ultra-sonication of residues for 1440 min led to release of 11.27±0.19% and 13.11±0.21% sugars (expressed as D-glucose), respectively. After enzymatic hydrolysis the composition of RD and L was: non-cellulosic polysaccharides (NCP) (7.79±0.15 and 9.86±0.16 g.100-1 g biomass, respectively), uronic acids (3.54±0.12 and 2.28±0.10 g.100-1 g biomass, respectively), cellulose (12.16±0.21 and 15.87±0.22 g.100-1 g biomass, respectively), and lignin (45.48±0.14 and 49.79±0.18 g.100-1 g biomass, respectively). The enzymatic treatment lead to two-fold decrease of the amount of cellulose and increase of lignin in the solid residues. The hydrothermal pretreatment was performed at 140 and 160℃ for 1 h. The following enzymatic hydrolysis led to increase of the released sugars: 13.65±0.29% and 15.95±0.18% for RD and L, respectively. After hydrothermal and enzymatic hydrolysis the composition of RD and L was: NCP (5.22±0.17 and 7.16±0.19 g.100-1 g biomass), uronic acids (1.67±0.15 and 1.08±0.09 g.100-1 g biomass), cellulose (8.04±0.16 and 9.87±0.19 g.100-1 g biomass), and lignin (55.61±0.24 and 57.92±0.17 g.100-1 g biomass), respectively.
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References
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